[ASP.NET Core] update network.protocol.version values as per spec

[vishweshbankwar]

Fixes #
Design discussion issue #

Changes

Assign values as per spec https://github.com/open-telemetry/semantic-conventions/blob/main/docs/http/http-spans.md#common-attributes

Merge requirement checklist

• CONTRIBUTING guidelines followed (nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Merging #5007 (9d65736) into main (b7bc57b) will decrease coverage by 0.01%.
The diff coverage is 50.00%.

❗ Current head 9d65736 differs from pull request most recent head aa9c92f. Consider uploading reports for the commit aa9c92f to get more accurate results

@@            Coverage Diff             @@
##             main    #5007      +/-   ##
==========================================
- Coverage   83.38%   83.37%   -0.01%     
==========================================
  Files         296      296              
  Lines       12467    12467              
==========================================
- Hits        10395    10394       -1     
- Misses       2072     2073       +1     

Flag	Coverage Δ
unittests	83.37% <50.00%> (-0.01%)	⬇️

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Files	Coverage Δ
...ntation.AspNetCore/Implementation/HttpTagHelper.cs	50.00% <50.00%> (ø)

... and 2 files with indirect coverage changes

[github-actions]

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